Test of Critical Behaviour Through the Order Parameter-Entropy Relation in the Normal-Incommensurate Phase Transition of Rb 2 ZnCl 4

2002 ◽  
Vol 270 (1) ◽  
pp. 351-356
Author(s):  
J. M. Martín-Olalla ◽  
M. C. Gallardo ◽  
S. Ramos ◽  
J. M. Perez-Mato ◽  
E. K. H. Salje
Keyword(s):  
Phase Transition ◽  
Order Parameter ◽  
Incommensurate Phase ◽  
Critical Behaviour ◽  
Entropy Relation

Critical behaviour in the commensurate-incommensurate phase transition of pure and γ-irradiated LiRbSO4crystals

1992 ◽  
Vol 38 (4) ◽  
pp. 229-236 ◽  
Author(s):  
M. E. Kassem ◽  
M. El-Muraikhi ◽  
L. Al-Houty ◽  
A. A. Mohamed
Keyword(s):  
Phase Transition ◽  
Incommensurate Phase ◽  
Critical Behaviour

Thermodynamical Behaviour of Quartz Around the Transitions Between α, Incommensurate and β Phases

1983 ◽  
Vol 21 ◽  
Author(s):  
G. Dolino ◽  
J.P. Bachheimer
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Order Parameter ◽  
Landau Theory ◽  
Microscopic Level ◽  
Incommensurate Phase ◽  
Small Temperature ◽  
Thermal Expansion Coefficients ◽  
Α Phase ◽  
Expansion Coefficients

ABSTRACTRecently an intermediate incommensurate phase has been found around 846 K in a small temperature range of 1.3 K between the usual α and β phases of quartz. In the neighborhood of these transitions most physical properties show drastic variations which has remained a puzzle. We shall present some measurements of the heat capacity Cp and of thermal expansion coefficients αi which present very large variations in the incommensurate phase. These divergences can be related by Pippard-Garland relations in the 3 phases. Furthermore in the low temperature α phase this result can be explained by the existence of a macroscopic order parameter η related to SiO4 tetrahedra, and varying as predicted by the Landau theory of 1st order phase transition. While in the high temperature phases (β and incommensurate) η vanishes, it takes a finite value in α phase, increasing continuously upon further cooling. However at the microscopic level, the discontinuity is reduced by the existence of the incommensurate phase, which corresponds probably to modulated tilting of SiO4 tetrahedra.

Critical Behaviour of Specific Heat in Ferroelectric K2ZnCl4and (NH4)2BeF4at Normal-Incommensurate Phase Transition

1993 ◽  
Vol 62 (5) ◽  
pp. 1597-1602 ◽  
Author(s):  
Hisashi Haga ◽  
Akira Onodera ◽  
Masaharu Tokunaga ◽  
Yôichi Shiozaki
Keyword(s):  
Phase Transition ◽  
Specific Heat ◽  
Incommensurate Phase ◽  
Critical Behaviour

Dynamics of the commensurate-incommensurate phase transition in C2O4D ND4, 1/2 D2O: a polarized Raman study under pressure

1993 ◽  
Vol 3 (4) ◽  
pp. 1007-1029 ◽  
Author(s):  
M. Krauzman ◽  
A. Colline ◽  
D. Kirin ◽  
R. M. Pick ◽  
N. Toupry
Keyword(s):  
Phase Transition ◽  
Incommensurate Phase ◽  
Raman Study ◽  
Polarized Raman

scholarly journals Study of physical properties of a ferrimagnetic spinel Cu1.5Mn1.5O4: spin dynamics, magnetocaloric effect and critical behavior

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25664-25676
Author(s):  
Abir Hadded ◽  
Jalel Massoudi ◽  
Sirine Gharbi ◽  
Essebti Dhahri ◽  
A. Tozri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Physical Properties ◽  
Magnetocaloric Effect ◽  
Phase Transition Temperature ◽  
Magnetic Phase Transition ◽  
Critical Behavior ◽  
Magnetic Phase ◽  
Spin Dynamics ◽  
Critical Behaviour

The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4.

Incommensurate Phase Transition in a Thin Film

2011 ◽  
Vol 413 (1) ◽  
pp. 399-408 ◽  
Author(s):  
A. A. Mirkin ◽  
A. L. Pirozerskiĭ ◽  
E. V. Charnaya ◽  
Cheng Tien
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Incommensurate Phase
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